[css-sizing-4] Per w3c#6308, only use the last remembered size when the element is skipping its contents, so you don't have the chance of a phantom size.

Author: tabatkins

css-sizing-4/Overview.bs

@@ -25,6 +25,7 @@ spec:css2; type: property
 	text: max-width
 	text: max-height
 spec:css-align-3; type:value; text:stretch
+spec:css-logical-1; type:property; text:block-size
 </pre>
 
 
@@ -551,10 +552,14 @@ Overriding Contained Intrinsic Sizes: the 'contain-intrinsic-*' properties</h3>
 		:: The corresponding axis has an [=explicit intrinsic inner size=] of the specified <<length>>.
 
 		: <dfn>auto <<length>></dfn>
-		:: The corresponding axis has an [=explicit intrinsic inner size=]
-			of its [=last remembered size=].
-			If a [=last remembered size=] does not exist,
-			instead use the specified <<length>>.
+		:: If the element has a [=last remembered size=],
+			and is currently [=skipping its contents=],
+			its [=explicit intrinsic inner size=]
+			is the [=last remembered size=].
+
+			Otherwise,
+			its [=explicit intrinsic inner size=]
+			is the specified <<length>>.
 	</dl>
 
 	If an element has an [=explicit intrinsic inner size=] in an axis,